package com.atguigu.reggie.service.impl;

import com.atguigu.reggie.entity.Category;
import com.atguigu.reggie.entity.Dish;
import com.atguigu.reggie.entity.Setmeal;
import com.atguigu.reggie.selfException.CustomException;
import com.atguigu.reggie.mapper.CategoryMapper;
import com.atguigu.reggie.service.CategoryService;
import com.atguigu.reggie.service.DishService;
import com.atguigu.reggie.service.SetmealService;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author Luo Sheng
 * @school YiBin university
 * @create 2022-10-11 17:20
 */
@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;

    @Autowired
    private SetmealService setmealService;
    /**
     * 根据id删除分类，删除之前需要进行判断
     */
    @Override
    public void remove(Long id) {

        // 创建一个dishLambdaQueryWrapper对象
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();

        // 查询分类是否关联了菜品，如果关联，抛出一个业务异常
        dishLambdaQueryWrapper.eq(Dish::getCategoryId, id);
        int count1 = dishService.count(dishLambdaQueryWrapper);

        if(count1 > 0){
            // 已经关联了菜品，抛出一个业务异常
            throw new CustomException("当前分类下关联了菜品，不能删除");

        }

        // 创建一个dishLambdaQueryWrapper对象
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();

        // 查询当前分类是否关联了套餐，如果已经关联，抛出一个业务异常
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,id);
        int count2 = setmealService.count(setmealLambdaQueryWrapper);

        if (count2 > 0){
            // 已经关联套餐，抛出一个业务异常
            throw new CustomException("当前分类关联了套餐，不能删除");
        }

        // 正常删除分类
        super.removeById(id);
    }
}
